import { describe, expect, test } from "bun:test";
import { openExecSession, type ExecWebSocket } from "../../lib/exec-api";

class FakeSocket implements ExecWebSocket {
  binaryType: "arraybuffer" | "blob" = "blob";
  readyState = 0;
  sent: string[] = [];
  closes: Array<[number | undefined, string | undefined]> = [];
  private listeners = new Map<string, Set<(event: any) => void>>();

  send(data: string) {
    this.sent.push(data);
  }

  close(code?: number, reason?: string) {
    this.closes.push([code, reason]);
    this.readyState = 3;
  }

  addEventListener(type: string, listener: (event: any) => void) {
    let values = this.listeners.get(type);
    if (!values) {
      values = new Set();
      this.listeners.set(type, values);
    }
    values.add(listener);
  }

  removeEventListener(type: string, listener: (event: any) => void) {
    this.listeners.get(type)?.delete(listener);
  }

  emit(type: string, event: any = {}) {
    if (type === "open") this.readyState = 1;
    for (const listener of [...(this.listeners.get(type) ?? [])])
      listener(event);
  }
}

const session = {
  token: "secret-token",
  expiresAt: "2099-01-01T00:00:00.000Z",
  user: { username: "user", roles: [] },
};

describe("exec WebSocket API", () => {
  test("authenticates the upgrade and maps protocol byte frames", async () => {
    const socket = new FakeSocket();
    let connection:
      | { url: string; headers: Readonly<Record<string, string>> }
      | undefined;
    const opening = openExecSession(
      "shop/demo",
      {
        deployment: "api",
        command: ["sh", "-c", "echo ok"],
        tty: true,
        columns: 120,
        rows: 40,
      },
      new AbortController().signal,
      {
        baseUrl: "https://api.test/api/v2",
        session,
        socketFactory(url, headers) {
          connection = { url, headers };
          return socket;
        },
      },
    );
    socket.emit("open");
    const client = await opening;

    expect(connection).toEqual({
      url: "wss://api.test/api/v2/workspaces/shop%2Fdemo/exec",
      headers: {
        authorization: "Bearer secret-token",
      },
    });
    expect(JSON.parse(socket.sent[0]!)).toEqual({
      type: "start",
      version: 1,
      deployment: "api",
      command: ["sh", "-c", "echo ok"],
      tty: true,
      columns: 120,
      rows: 40,
    });

    client.sendStdin(new TextEncoder().encode("hello"), true);
    client.resize(80, 24);

    const iterator = client[Symbol.asyncIterator]();
    socket.emit("message", {
      data: JSON.stringify({
        type: "stdout",
        data: "b3V0",
        encoding: "base64",
      }),
    });
    expect(await iterator.next()).toEqual({
      done: false,
      value: { type: "stdout", data: new TextEncoder().encode("out") },
    });

    expect(JSON.parse(socket.sent[1]!)).toEqual({
      type: "stdin",
      data: "aGVsbG8=",
      encoding: "base64",
      eof: true,
    });
    expect(JSON.parse(socket.sent[2]!)).toEqual({
      type: "resize",
      columns: 80,
      rows: 24,
    });

    socket.emit("message", {
      data: JSON.stringify({ type: "exit", exitCode: 7 }),
    });
    expect((await iterator.next()).value).toEqual({
      type: "exit",
      exitCode: 7,
    });
    socket.emit("close");
    expect((await iterator.next()).done).toBe(true);
  });

  test("closes an active connection when cancelled", async () => {
    const socket = new FakeSocket();
    const controller = new AbortController();
    const opening = openExecSession(
      "shop",
      { deployment: "api", command: ["sh"], tty: false },
      controller.signal,
      { session, socketFactory: () => socket },
    );
    socket.emit("open");
    const client = await opening;
    const next = client[Symbol.asyncIterator]().next();
    controller.abort();
    expect((await next).done).toBe(true);
    expect(socket.closes).toContainEqual([1000, "aborted"]);
  });

  test("rejects malformed server frames and closes with protocol error", async () => {
    const socket = new FakeSocket();
    const opening = openExecSession(
      "shop",
      { deployment: "api", command: ["sh"], tty: false },
      new AbortController().signal,
      { session, socketFactory: () => socket },
    );
    socket.emit("open");
    const client = await opening;
    const next = client[Symbol.asyncIterator]().next();
    socket.emit("message", {
      data: JSON.stringify({ type: "stdout", data: 1 }),
    });
    await expect(next).rejects.toThrow("Invalid exec output frame");
    expect(socket.closes).toContainEqual([1002, "invalid frame"]);
  });
});